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Forums > C64 Coding > Spindle and Sparkle demos not launching
2024-10-29 21:01
mankeli

Registered: Oct 2010
Posts: 135
Spindle and Sparkle demos not launching

Can someone explain why demos using Sparkle or Spindle loaders can't be run from 1541U by selecting the launch file and using "mount & run"?

You got to use "Run Disk" for the whole image. 99.9999% of the C64 demos can be launched with mount & run, and somehow this only seems affect those aforementioned loaders.
 
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2024-10-30 06:38
Burglar

Registered: Dec 2004
Posts: 1082
I just checked Martin's theory on No Bounds and it is not the case. It simply embeds the drivecode bootstrapping with M-E and short embedded code that reads the relevant sectors to drivemem. This is a pretty common method.
2024-10-30 09:05
Martin Piper

Registered: Nov 2007
Posts: 706
Quote: I just checked Martin's theory on No Bounds and it is not the case. It simply embeds the drivecode bootstrapping with M-E and short embedded code that reads the relevant sectors to drivemem. This is a pretty common method.

I remember now, it was the transwarp example that issues a M-E with the partial just loaded file in the read buffer: Transwarp V0.84
2024-10-30 12:11
mankeli

Registered: Oct 2010
Posts: 135
This seems to happen on later 1541 ultimates as well, iirc maybe even on the U64. I'll check later tonight.
2024-10-30 17:45
mankeli

Registered: Oct 2010
Posts: 135
This happens on U64 too. (Ultimate 64 Elite V1.43 - 3.11) Aerial Core for example doesn't work with mount & run, it needs run disk.
2024-10-31 01:05
Burglar

Registered: Dec 2004
Posts: 1082
why use the graphical interface, why not control the 1541u via tcp?

maybe check ugo 0.1 or Ucodenet (20200408). u can also do seamless disk swapping that way.
2024-10-31 07:12
The Sarge

Registered: Aug 2002
Posts: 47
If you want, you can use Assembly64. It has an inbuilt "Flip Disk Player" that takes care of this for you. Multi-disk demos are started with this feature, and you don't even have to swap disks; it does this for you automatically.
The Flip Disk Player has been adjusted in most of the popular demos mitigating this problem with Ultimates right now.

https://assembly64.hackerswithstyle.se/assembly/download.html
2024-10-31 11:42
tlr

Registered: Sep 2003
Posts: 1780
maybe it is due to the drive not being 'I' initialized, which more or less happens when loading something?

EDIT: could be tested by loading the first file, then power cycling the drive before doing "RUN".
2024-10-31 14:44
chatGPZ

Registered: Dec 2001
Posts: 11327
Quote:
maybe it is due to the drive not being 'I' initialized, which more or less happens when loading something?

good one. i remember this case was tricky to fix in chameleon :)
2024-10-31 17:38
mankeli

Registered: Oct 2010
Posts: 135
Yeah, this works:
LOAD"*",8,1
RUN

But this doesn't:
LOAD"*",8,1
*drive reset*
RUN


So it's indeed the loader depending on some state on the drive. Funny, since atleast Spindle works with the Action Replay fast loader.
2024-10-31 18:00
LordCrass

Registered: Apr 2023
Posts: 8
It's because of the disk ID bytes at drive memory $12/$13. A shortcut is given to execute an FDC read job, which at some point compares on-disk ID to what is expected, but what is expected hasn't been set and is just $00, so error 29 Disk ID Mismatch occurs.
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